On Tue, 12 Dec 2017 00:20:48 +0100, Frank Steinmetzger wrote: > My new drives are finally here. One of them turned out to be an OEM. -_- > The shop says it will cover any warranty claims and it’s not a backyard > seller either, so methinks I’ll keep it. > > To evaluate LUKS, I created the following setup (I just love > ASCII-painting in vim ^^): > > ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ > ┃ tmpfs ┃ > ┃ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┃ > ┃ │ 1 GB file │ │ 1 GB file │ │ 1 GB file │ │ 1 GB file │ ┃ > ┃ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ ┃ > ┃ V V V V ┃ > ┃ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┃ > ┃ │ LUKS device │ │ LUKS device │ │ LUKS device │ │ LUKS device │ ┃ > ┃ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ ┃ > ┃ V V V V ┃ > ┃ ┌─────────────────────────────────────────────────────────────┐ ┃ > ┃ │ RaidZ2 │ ┃ > ┃ └─────────────────────────────────────────────────────────────┘ ┃ > ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
That means every write has to be encrypted 4 times, whereas using encryption in the filesystem means it only has to be done once. I tried setting encrypted BTRFS this way and there was a significant performance hit. I'm seriously considering going back to ZoL now that encryption is on the way. -- Neil Bothwick A printer consists of three main parts: the case, the jammed paper tray and the blinking red light.
pgpUnW2AscJDx.pgp
Description: OpenPGP digital signature
